吼
hoǔ · HSK 7
to roar
🦁 口 mouth + 孔 (kǒng, phonetic) = the mouth opens wide to roar
The 口 mouth radical marks it as a vocal act, while 孔 carries the sound. Pinyin hoǔ also echoes English how or a hound's howl, both loud open-mouthed noises.
吼 — mouth 口 + ruler/sign 后
A phono-semantic compound: 口 (mouth) gives the meaning, since 吼 refers to a loud vocal sound, while 后 supplies the pronunciation. It originally described the roar of animals like tigers or lions, and later extended to any loud shout or roar by people.